When you want to attach a file to a Service Catalog request, that filename could exist of diacritic character(s).
CA Service Catalog - All Supported versions.
To allow diacritic character(s) in a file name, please follow the steps below:
1. Locate the file %USMHOME%/view/conf/ESAPI.properties
2. Open this file in a text editor
3. Search for 'Validator.FileName'. Typically this property is at the bottom of the file.
4. Replace the regular expression as
Some other details/example taken from my local server:
#Validator.FileName=^[a-zA-Z0-9!@#$%^&{}\\[\\]()_+\\-=,.~'` ]{1,255}$
Validator.FileName=^[a-zA-Z0-9\\p{L}!@#$%^&{}\\[\\]()_+\\-=,.~'`]{1,255}$
5. Save the file and restart Catalog service. Check the new behavior.